*Laboratory of Molecular and Cellular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD ´ Montpellier 2, 34095 Montpellier, France 20892-0830; and ‡Institut des Sciences de l’Evolution, Case Courrier 064, Universite Communicated by Herbert Tabor, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, July 24, 1998 (received for review May 22, 1998) This difference stems from the distinct biological properties…
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